Finishing room



Jan. 1, 1929. 1,697,079 R. F. ONSRUD FINISHING ROOM Filed May 1927 m, yv Ina/ 7152 wflzase film 01 fi fammd.

* v @M*M Patented Jan. 1, 1929.

; LSQLWQ RUDOLPH F. ONSRUD,' 0F CHICAGO, ILLINOIS.

FINISHING ROOM.

Application filed May 7, 1927. Serial No. 189,600.

This invention relates to finishing chambers and more particularly tofinishingchambers provided with one or more spray booths.

The main objects of this invention are to provide a finishing chamberhaving an improved. interior constructional arrangement wherein theusual exhaust fan is. dispensed with, thereby reducing the fire hazardtoa minimum ;:to provide asealedfinishing chamber having one or morespray booths, each provided with a controlled exhaust port and means forsupplying conditioned air under pressure to said chamber, whereby theflow of air therethrough will carry the fumes and paint laden air outthrough the exhaust ports; and to provide a finishing chamber havingimproved means of ingress and egress in order that there may be aminimum of air disturbance during the spraying process.

An illustrative embodiment of the invention is shown in the accompanyingdrawings in which is shown a perspective view ofthe interior of thesealed finishing chamber, the ceiling and portions of some of the wallsbeing broken away to better show its interior.

In prior types of finishing chambers having one or more spray booths,each spray booth. has been provided with an electrically operatedexhaust fan for carrying the fumes and paint laden air from the vicinityof the article being finished. Fires were frequently caused by thesparking of the electric fan motor because of the inflammable and.explosive nature of the paint fumes within the booths.

In the present construct-ion means are provided for supplyingconditioned air under pressure to a sealed chamber having one or morespray booths and each spray booth is provided with an exhaust porthaving means such as a damper for varying the flow of air through itsrespective port. No exhaust fan is used, the flow of air being caused bythe pressure of the air within the finishing chamber being greater thanatmospheric.

The finishing chamber shown in the draw ings is sealed with theexception of inlet and outlet ports within four walls, the front wall,ceiling and portions of the side walls being broken away to show theinterior construction. The side wall 1 is provided with an air intakefan or blower 2 which draws conditioned air through the conduit 3 anddischarges it into the chamber. This conduit communicates with an airconditioner 4: which heats, filters,.and humidifies the air prior toout, materially disturbing the air within the chai'nber.

The interior of the finishingchamber is provided with a spray booth 7which hasan archedceiling 8, a rear wall:9 which is aipart of the rearwallof the chamber, andsido Walls l0and 11. The rear wall 9 of the spraybooth is provided with an exhaust port 12 which may be varyingly openedand closed by a damper 1.3. The side wall 10 has a glass window 14 foradmitting light, and the side wall 11 has a hook 15 for supporting theflexible hose of a spray pressure tank 16. The spray booth is open atits front side and is in direct communication with the interior of thefinishing chamber.

The spray booth is provided with a table having a revolving top 17mounted on a pedestal 18 and is adapted to support the article, such asa chair 19, that is being finished.

An electric light 20, mounted on the wall 1, is wired with a suitablesource of electric current. This light is adapted to project its lightthrough the window 14; of the spray booth in order that the sprayingoperation may be illuminated without having a light located directlywithinv the booth. This ligl'iting arrangement further reduces the firehazard.

In operation, the finishing room serves as a plenum chamber into whichconditioned air under pressure is forced by the fan 2. The staticpressure of the conditioned air within the finishingroom being greaterthan atmospheric, causes a rapid flow through the open end of the spraybooth and out through the exhaust port 12 carrying the fumes and paintladen air away from the vicinity of the article being finished. Therapidity of flow of air through the exhaust port may be varyinglycontrolled by means of the damper 13.

With this arrangement the usual electric motor driven exhaust fan withinthe spray booth is eliminated and the fire hazard is thereby reduced toa minimum.

While but one specific embodiment of this invention has been hereinshown and described, it will be understood that details of theconstruction shown may be altered or omitted without departing from thespirit of this invention as defined by the following claims. 1

I claim:

1. A spray booth open at the front and having an exhaust port at therear, a sealed )lennm chamber communicating with said booth at thefront, and means for maintaining a greater than atmospheric pressure insaid sealed plenum chamber to induce a rear ward flow of air through thebooth.

2. The combination of a sealed finishing chamber, a spray booth in saidchamber, said spray booth having an exhaust port, and means for,supplying: air to said chamber with suiiicient pressure to cause a flowof air through said booth to exhaust port for carry ing away fumes andthe excess of paint laden air.

3. The combination of a sealed finishing chamber, a spray booth in saidchamber, said spray booth having an exhaust port, means for supplyingair to said chamber with sufiicient pressure to cause a flow of airthrough said booth to exhaust port for carrying away fumes and theexcess of paint laden air, and. means for varying the flow of airthrough said exhaust port.

4. The combination of a sealed finishing chamber, a spray booth in saidchamber, said spray booth having an exhaust port, means for supplyingair to said chamber with sufficient pressure to cause a flow of airthrough said booth to exhaust port for carrying away fumes and theexcess of paint laden air, and a revolving door in one wall of saidchamber for permitting ingress and egress to and from said ch amberwithout disturbing the fiow of air therein.

Signed at Chicago this 4th day of May,

RUDOLPH F. ONSRUD.

